package com.dvj.gulimall.auth.controller;

import com.alibaba.fastjson.TypeReference;
import com.dvj.common.constant.AuthServerConstant;
import com.dvj.common.exception.BizCodeEnum;
import com.dvj.common.utils.R;
import com.dvj.common.vo.MemberRespVo;
import com.dvj.gulimall.auth.feign.MemberFeignService;
import com.dvj.gulimall.auth.feign.ThirdPartFeignService;
import com.dvj.gulimall.auth.vo.UserLoginVo;
import com.dvj.gulimall.auth.vo.UserRegistVo;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * @author Dvj
 * @date 2021/8/4 17:26
 */
@Controller
public class LoginController {

    @Autowired
    ThirdPartFeignService thirdPartFeignService;

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    private MemberFeignService memberFeignService;

    /**
     * 发送一个请求直接跳转到一个页面。
     * SpringMVC viewcontroller；将请求和页面映射过来.
     */

    @ResponseBody
    @GetMapping("/sms/sendcode")
    public R sendCode(@RequestParam("phone") String phone) {
        // 1.接口防刷

        if (StringUtils.isBlank(phone) || phone.length() < 11) {
            return R.error("非法手机号");
        }

        String redisCode = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone);
        if (!StringUtils.isEmpty(redisCode)) {
            long l = Long.parseLong(redisCode.split("_")[1]);
            if (System.currentTimeMillis() - l < 60 * 1000) {
                // 60秒内不能再发
                return R.error(BizCodeEnum.SMS_CODE_EXCEPTION);
            }
        }

        // 2. 验证码的再次校验：redis，存key-phone，value-code，sms：code:12354621254 -> 12345
        String code = UUID.randomUUID().toString().substring(0, 5) + "-" + System.currentTimeMillis();

        // 模拟已发短信，默认手机号前5位
        code = phone.substring(0, 5);
        // redis缓存验证码，防止同一个phone在60秒内再次发送验证码
        redisTemplate.opsForValue().set(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone, code, 10, TimeUnit.MINUTES);

        //thirdPartFeignService.sendCode(phone, code);
        return R.ok();
    }

    /**
     * //TODO 重定向携带数据，利用session原理。将数据放在session中。
     * 只要跳到下一个页面取出这个数据以后，session里面的数据就会删掉
     * <p>
     * //TODO 1、分布式下的session问题。
     * RedirectAttributes redirectAttributes：模拟重定向携带数据
     *
     * @param vo
     * @param result
     * @param redirectAttributes
     * @return
     */
    @PostMapping("/regist")
    public String regist(@Valid UserRegistVo vo, BindingResult result,
                         RedirectAttributes redirectAttributes,
                         HttpSession session) {
        if (result.hasErrors()) {

            /*
             * .map(fieldError -> {
             *                 String field = fieldError.getField();
             *                 String defaultMessage = fieldError.getDefaultMessage();
             *                 errors.put(field,defaultMessage);
             *                 return
             *             })
             */
            Map<String, String> errors = result.getFieldErrors()
                    .stream().collect(Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage, (k1, k2) -> k1 + "," + k2));
//            model.addAttribute("errors",errors);
            redirectAttributes.addFlashAttribute("errors", errors);
            //Request method 'POST' not supported
            //用户注册->/regist[post]----》转发/reg.html（路径映射默认都是get方式访问的。）

//            session.set
            //校验出错，转发到注册页
            return "redirect:http://auth.gulimall.com/reg.html";
        }


        //1、校验验证码
        String code = vo.getCode();

        String s = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
        if (!StringUtils.isEmpty(s)) {
            if (code.equals(s.split("_")[0])) {
                //删除验证码;令牌机制
                redisTemplate.delete(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
                //验证码通过。 //真正注册。调用远程服务进行注册
                R r = memberFeignService.regist(vo);
                if (r.getCode() == 0) {
                    //成功
                    return "redirect:http://auth.gulimall.com/login.html";
                } else {
                    Map<String, String> errors = new HashMap<>();
                    errors.put("msg", r.getData("msg", new TypeReference<String>() {
                    }));
                    redirectAttributes.addFlashAttribute("errors", errors);
                    return "redirect:http://auth.gulimall.com/reg.html";
                }

            } else {
                Map<String, String> errors = new HashMap<>();
                errors.put("code", "验证码错误");
                redirectAttributes.addFlashAttribute("errors", errors);
                return "redirect:http://auth.gulimall.com/reg.html";
            }
        } else {
            Map<String, String> errors = new HashMap<>();
            errors.put("code", "验证码错误");
            redirectAttributes.addFlashAttribute("errors", errors);
            //校验出错，转发到注册页
            return "redirect:http://auth.gulimall.com/reg.html";
        }
    }

    @GetMapping("/login.html")
    public String loginPage(HttpSession session) {
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (attribute == null) {
            // 没登录
            return "login";
        } else {
            return "redirect:http://gulimall.com";
        }
    }

    @PostMapping("/login")
    public String loginPage(UserLoginVo vo, RedirectAttributes redirectAttributes,
                            HttpSession session) {
        // 远程登录
        R login = memberFeignService.login(vo);
        if (login.getCode() == 0) {
            // 成功
            MemberRespVo data = login.getData(new TypeReference<MemberRespVo>() {
            });
            session.setAttribute(AuthServerConstant.LOGIN_USER, data);
            return "redirect:http://gulimall.com";
        } else {
            Map<String, String> errors = new HashMap<>();
            errors.put("msg", login.getMsg());
            redirectAttributes.addFlashAttribute("errors", errors);
            return "redirect:http://auth.gulimall.com/login.html";
        }

    }
}
